The indigo 3d smith machine is the strongest smith machine that indigo do indigo fitness was formed in 2014 by the merger of indigo23 and leisure lines indigo specialises in equipment for weightlifting strength and conditioning designing and manufacturing station strength equipment at it s factory right here in the uk key features of the indigo 3d smith machine allows unrestricted joint movement and core activation not found with a traditional linear smith machine a safe effective tool for